Complie error: loses precision ( wxMSW-2.8.12 mingw64)

[tmacchant]

I am now trying to build wxMSW-2.8.12 on x86_64-w64-mingw32 on Cygwin. (64 bit version wxMSW-2.8.12 )
The following compile error appeared.

Code: Select all

/cygdrive/e/usr/Tatsu/mingw64home/tools/wx/build-2.8.12/bk-deps x86_64-w64-mingw32-g++ -c -o basedll_msw_thread.o -I./.pch/wxprec_basedll -D__WXMSW__     -DWXBUILDING -I../wxMSW-2.8.12/src/tiff     -I../wxMSW-2.8.12/src/regex -I../wxMSW-2.8.12/src/expat/lib -DwxUSE_GUI=0 -DWXMAKINGDLL_BASE -DwxUSE_BASE=1  -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -I/cygdrive/e/usr/Tatsu/mingw64home/tools/wx/build-2.8.12/lib/wx/include/x86_64-w64-mingw32-msw-ansi-release-2.8 -I../wxMSW-2.8.12/include -I/cygdrive/c/Programs/gplibs64/include -DWX_PRECOMP -Wall -Wundef -Wno-ctor-dtor-privacy -O2 -fno-strict-aliasing -O3 ../wxMSW-2.8.12/src/msw/thread.cpp
../wxMSW-2.8.12/src/msw/thread.cpp: In static member function 'static THREAD_RETVAL wxThreadInternal::DoThreadStart(wxThread*)':
../wxMSW-2.8.12/src/msw/thread.cpp:525:43: error: cast from 'void*' to 'THREAD_RETVAL' loses precision
../wxMSW-2.8.12/src/msw/thread.cpp: In member function 'wxThreadError wxThreadInternal::WaitForTerminate(wxCriticalSection&, void**, wxThread*)':
../wxMSW-2.8.12/src/msw/thread.cpp:845:21: error: cast from 'void*' to 'DWORD' loses precision
../wxMSW-2.8.12/src/msw/thread.cpp: In member function 'void wxThread::Exit(void*)':
../wxMSW-2.8.12/src/msw/thread.cpp:1165:28: error: cast from 'void*' to 'unsigned int' loses precision
make: *** [basedll_msw_thread.o] Error 1

Any suggestions ?

Thanks in advance.

Tatsuro

[briceandre]

With a 64 bits compiler, a void* is 8 bytes long. I suppose wxWidgets coders did not take that into account when coding this part of the code.

The problem is that this error can either be harmfull or problematic depending on what is stored in this void*. I highly suspect that the conversion will not cause any trouble, but I am not sure.
So, my suggestions are :

• You compile everything with a 32bits compiler
• Or, you file a bug and wait for a full support of wxWidgets for 64 bits
• Or you try to configure your compiler so that it does not complain about those conversions (not sure this is feasible, and if the conversion is problematic, the resulting application could crash)
• Or you patch the wxWidgets code to perform an explicit cast (in this case, I am sure this is feasible, but the same remark as previous point applies for the possible crash of the resulting application)

Personnaly, if you do not have good reasons for something else, I would choose the first solution.

[tmacchant]

So, my suggestions are :

• You compile everything with a 32bits compiler
• Or, you file a bug and wait for a full support of wxWidgets for 64 bits
• Or you try to configure your compiler so that it does not complain about those conversions (not sure this is feasible, and if the conversion is problematic, the resulting application could crash)
• Or you patch the wxWidgets code to perform an explicit cast (in this case, I am sure this is feasible, but the same remark as previous point applies for the possible crash of the resulting application)

I have already compile wxWidgets with 32 bit compiler for gnuplot for windows 32 bit. I am now trying to build 64 bit compiling.
I will wait for a full support of wxWidgets for 64 bits

Thanks!

[doublemax]

Please try again with wx 2.9.2. If you get the same problems, please file a bug report here:
http://trac.wxwidgets.org/

[tmacchant]

>>Please try again with wx 2.9.2. If you get the same problems, please file a bug report here:

With wx 2.9.2, the build itself went well. Thanks!!

However, the gdiplus for mingw64 seems to be available yet.
(I have googled on this topic. I could not find a solution.)
I will see how the lack of gdiplus will affect using the wxWidges on mingw64.